Question

4. If a, (a - 2)and 3a are in A.P.then the value of a is​

Answer 1

a , a-2 , 3a are in AP

so it's common difference between the terms is equal

common difference (d) :

=>a2-a1 =a3-a2

=>a-2-a=3a-(a-2)

=>-2=3a-a+2

=>-2=2a+2

=>2a= -2-2

=>a= -4/2

=>a=-2